Protein sequence alignment using binary string
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1 Available online at Scholars Research Library Der Pharmacia Lettre, 2015, 7 (5): ( ISSN USA CODEN: DPLEB4 Protein sequence alignment using binary string M. Yamuna, Jyotsna Rupaliya and Bhawana Singh VIT University, Vellore, Tamilnadu, India ABSTRACT Medical DNA databases provide a rich source of genetic and medical data. Researchers probably use this data to find treatments for different disorders, with a of furthering medical research to help people suffering from various conditions and disorders. Medical and pharmaceutical researches use these DNA database for discovering new medicines. Protein sequence alignment is important, as it helps in determining evolutionary relationship, which are descended from a common ancestor. Various techniques are developed and proposed. A binary string is always computation friendly. In this paper we propose a method of determining protein sequence alignment using binary strings, developed using properties of proteins. Keywords: Protein, Sequence Alignment, Binary, Polar, Hydrophobic. INTRODUCTION DNA database began when hospitals and other medical research centres started collecting DNA samples. These samples are used in research by medical, chemical and drug researchers. Protein sequence alignment is used in determining evolutionary relationships. In this paper we develop a technique of determining if two sequences of same length are aligned using binary strings. Various methods are already available. We propose this method based on the idea that binary sequences are computational friendly [ 1 ] [ 2 ]. Sequence Alignment Sequence alignment is used in determining the similarity regions between different sequences. In many cases, the input set of query sequences are assumed to have an evolutionary relationship by which they share a lineage and are descended from a common ancestor [ 3 ]. In bioinformatics, a sequence alignment is a way of arranging the sequences of DNA, RNA, or protein to identify regions of similarity that may be a consequence of functional, structural, or evolutionary relationships between the sequences. Aligned sequences of nucleotide or amino acid residues are typically represented as rows within a matrix. Gaps are inserted between the residues so that identical or similar characters are aligned in successive columns [ 4]. MATERIALS AND METHODS Proposed Method for Protein Sequence Alignment Construction of the Codon Table We construct a six bit binary string codon table. For this construction we use properties of proteins. The properties used for the construction of the binary string is given in Table 1 220
2 Table 1 S. No Bits Property String 1 1 Hydrophobic 0 Hydrophilic 1 2 2, 3 Neutral Nonpolar 00 Basic Polar 01 Neutral Polar 10 Acidic Polar , 5, 6 Purine 0 Pyramidine 1 Based on the discussion in Table 1 the binary string for the twenty amino acids is given in Table 2 [ 5 ], and hence the codon table that can be used for protein sequence comparison is provided in Table 3 S.No Amino Acid Structure Properties Codon Binary String 1. Alanine Hydrophobic, Neutral Non polar GCU GCC GCA GCG 2. Arginine Hydrophilic, Basic polar CGU CGC CGA CGG AGA AGG Asparagine Hydrophilic, Neutral polar AAU AAC 4. Aspartate Hydrophilic, Acidic polar GAU GAC Cysteine Hydrophilic, Neutral polar UGU UGC 6. Glutamate Hydrophilic, Acidic polar GAA GAG
3 7. Glutamine Hydrophilic, Neutral polar CAA CAG Glycine Hydrophilic, Neutral Non polar GGUG GGC GGA GGG 9. Histidine Hydrophilic, Basic polar CAU CAC Isoleucine Hydrophobic, Neutral Non polar AUU AUC AUA 11. Leucine Hydrophobic, Neutral Non polar UUA UUG CUU CUC CUA CUG 12. Lysine Hydrophilic, Basic polar AAA AAG 13. Methionine Hydrophobic, Neutral Non polar AUG 222
4 14. Phenylalanine Hydrophobic, UUU UUC 15. Proline Hydrophobic, Neutral Non polar CCU CCC CCA CCG 16. Serine Hydrophilic, Neutral polar AGU AGC 17. Threonine Hydrophilic, Neutral polar ACU ACC ACA ACG Tryptophan Hydrophobic, Neutral Non polar UGG Tyrosine Hydrophilic, Neutral polar UAU UAC 20. Valine Hydrophobic, Neutral Non polar GUU GUC GUA GUG 223
5 Table 2 U U C A G UUU UCU UAU UGU U UUC UCC UAC UGC C UUA UCA UAA STOP UGA STOP A UUG UCG UAG STOP UGG G C CUU CCU CAU CGU U CUC CCC CAC CGC C CUA CCA CAA CGA A CUG CCG CAG CGG G AUU ACU AAU AGU U A AUC 0 ACC AAC AGC C AUA ACA AAA AGA A AUG ACG AAG AGG G GUU GCU GAU GGU U G GUC GCC GAC GGC C GUA GCA GAA GGA A GUG GCG GAG GGG G Table A R N D C E Q G H I L K M F P S T W Y V Protein Alignment Verification Procedure The codon table constructed can be used in protein sequence alignment, provided the sequences are of the same length. It verifies the one to one correspondence between the sequences. Let S1: KVFGRCELAAAM, S2: KQFTKCFLSQNL be the two protein sequences. Step 1 Convert S1 and S2 into binary sequences using Table 3. Step 2 Apply OR operation ( 1 1 = 0, 1 0 = 1, 0 1 = 1, 0 0 = 0 ) on the two strings. Step 3 If the number of 1 s in all the resulting string is 0, then the protein sequences are related. RESULTS AND DISCUSSION In this section we verify the procedure by an illustration. Let S1 and S2 be the sequences to be verified for alignment. Table 4 S1 K V F G R C E L A A A M S2 K Q F T K C F L S Q N L OR From Table 4 we see that the sequences are not related because in the last row not all the entries in the last row is
6 CONCLUSION Different techniques are available for determining if two sequences are related or not. The proposed method Is simple and user friendly since it uses binary strings. Is computational friendly since it is ready available in binary string format. Can be easily programmed since it uses only OR operation. The binary string is constructed based on the properties of the proteins, which justifies the binary string comparison. Due to the compact and user friendly process, the proposed method is good for determining if two protein sequences are aligned or not. Similar technique can be adopted for comparing other sequences like DNA, RNA. REFERENCES [1] [2] [3] en.wikipedia.org/wiki/multiple_sequence_alignment [4] wikipedia.org/wiki/sequence_alignment [5] 225
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